A raw cucumber with peel has about 140 to 150 mg of potassium per 100 grams, and a whole large one gives around 440 mg.
Cucumber is not a potassium heavyweight, yet it does give you a tidy amount for so few calories. That is why the number can feel smaller than people expect. A cucumber is full of water, so the mineral count stays modest unless you eat a big portion.
If you want the plain answer, start here: raw cucumber with peel lands at about 147 mg of potassium per 100 grams. A 1/2 cup of slices gives about 76 mg. One full 8 1/4-inch cucumber reaches about 442 mg. Those figures come from USDA nutrient data, while the FDA raw vegetable chart puts 1/3 of a medium cucumber at 140 mg.
Potassium In Cucumber By Serving Size And Cut
The serving size changes the number more than anything else. A few slices on a sandwich barely move the needle. A whole cucumber in a salad bowl is a different story. Peel matters a bit too, since some potassium sits in the outer layer, though the gap is not huge.
That makes cucumber handy in two ways. If you are trying to raise potassium little by little, a whole cucumber can chip in. If you need to watch potassium for kidney reasons, cucumber is often easier to fit than many starchy vegetables.
Why People Get Mixed Up About The Amount
Most nutrition labels use small serving sizes, while home cooking does not. One person says “I ate some cucumber” and means five slices. Another means a full English cucumber with lunch. Same food, different count.
Data sources can vary a touch as well. One chart may use a weighed serving, while another uses a volume measure such as cups or slices. The number is still in the same ballpark, so the bigger question is how much cucumber is on your plate.
What The Number Means In Daily Terms
Potassium has a Daily Value of 4,700 mg on U.S. food labels. So 100 grams of raw cucumber with peel gives just over 3% of that mark. A whole large cucumber gets closer to 9% to 10%.
That tells you where cucumber belongs. It is a light contributor, not a top source. You would not pick it as your main potassium food, yet it can still add up across the day when it shows up in salads, wraps, cold noodle bowls, and snack plates.
- A few slices: low potassium.
- One cup of slices: still modest.
- One whole large cucumber: a fair bump for a food this light.
- Paired with tomatoes, beans, yogurt, or potatoes: the meal total rises fast.
If you want to verify the raw numbers, the USDA FoodData Central entry for raw cucumber and the FDA raw vegetable chart are the cleanest places to start.
How Much Potassium In Cucumber? Portion Table
The table below uses USDA raw cucumber data with peel as the base point. Some rows are direct serving figures from the data set, while others are scaled from the 100-gram value to match common home portions. That gives you a practical range instead of one lonely number. It lets you match slices, cups, and whole cucumbers without mental math at the table.
| Serving | Potassium | What It Means |
|---|---|---|
| 5 thin slices, about 20 g | About 29 mg | Almost none in meal-planning terms |
| 1/4 cup slices, about 26 g | About 38 mg | Small garnish level |
| 1/2 cup slices, 52 g | 76 mg | Light snack or side salad add-on |
| 1/3 medium cucumber, 99 g | 140 mg | Near the 100 g benchmark |
| 100 g raw cucumber with peel | 147 mg | A little over 3% of Daily Value |
| 1 cup slices, about 104 g | About 153 mg | A solid bowlful, still modest |
| 200 g, about two hearty cups | About 294 mg | Closer to what a full salad may hold |
| 1 whole large cucumber, 301 g | 442 mg | Roughly 9% of Daily Value |
Is Cucumber A High-Potassium Food?
No. It sits in the lower-to-middle range. That is not a knock on cucumber. It just means the food shines for crunch, hydration, and volume more than mineral density.
Think of cucumber as a “steady extra” food. It nudges your intake up without much sugar, fat, or sodium. That can be useful when you want meals that feel fresh and filling. If your goal is a big potassium jump, foods such as potatoes, beans, yogurt, and leafy greens usually do more work per serving.
When Cucumber Makes Sense For Potassium
Cucumber earns its place when you want a meal that feels light but not empty. Add a whole chopped cucumber to grain salad, tuna salad, or a yogurt bowl with herbs, and the total starts to look better. It is not just the cucumber doing the job. It is the stack of foods around it.
That is one reason potassium advice often points to overall eating patterns instead of one magic food. The NIH potassium fact sheet spells out that many people fall short, and that food sources are the usual place to start.
When You May Want To Be Careful
If you have kidney disease, high blood potassium, or take medicines that can raise potassium, the math changes. Cucumber is milder than many vegetables, yet your total from the full meal still counts. In that case, personal medical advice beats generic food lists every time.
For most healthy adults, the bigger issue is not “too much cucumber potassium.” It is getting enough potassium across the day while keeping sodium in check. That sodium-potassium balance matters for blood pressure, which is why food pattern beats one single ingredient.
Best Ways To Get More Potassium From Cucumber Meals
You do not need fancy prep. Portion size and pairings matter more.
- Use the whole cucumber. A few slices taste good, yet a full chopped cucumber gives a far better return.
- Leave the peel on. Wash it well, then keep the skin for a small mineral bump and more texture.
- Pair it with richer foods. Tomato, plain yogurt, chickpeas, lentils, and edamame turn cucumber from a side note into part of a meal with real potassium weight.
- Do not count pickles the same way. Pickling changes the food story fast because sodium climbs. If blood pressure is on your mind, raw cucumber is usually the cleaner pick.
One easy rule works well: if cucumber is the base of the bowl instead of the garnish, the potassium starts to matter. If it is just three slices under a burger bun, the number stays tiny.
Practical Meal Swaps And Portion Picks
This second table is built for real-life choices. It helps you match the portion to your goal instead of guessing from a nutrition app mid-meal.
| If You Want | Pick This | Likely Potassium From Cucumber |
|---|---|---|
| Just crunch on a sandwich | 4 to 6 slices | Under 40 mg |
| A light side salad | 1/2 cup slices | 76 mg |
| A full salad base | 1 to 2 cups sliced | About 153 to 294 mg |
| A filling snack plate | 1/3 to 1/2 medium cucumber | About 140 to 220 mg |
| The most from cucumber alone | 1 whole large cucumber | 442 mg |
The Simple Takeaway
Cucumber gives a modest dose of potassium, not a giant one. The clean benchmark is about 147 mg per 100 grams with peel. A whole large cucumber can push that up to roughly 442 mg, which is enough to count but not enough to anchor your whole day.
So if that question sent you here, the honest answer is “some, not a ton.” That makes cucumber a handy add-on food. It is easy to eat, easy to pair, and easy to scale up when you want a fresher meal with a little more potassium built in.
References & Sources
- U.S. Department of Agriculture.“FoodData Central: Cucumber, With Peel, Raw.”Lists the base nutrient data used for the per-100-gram, 1/2-cup, and whole-cucumber figures.
- U.S. Food and Drug Administration.“Nutrition Information For Raw Vegetables.”Gives the FDA chart value of 140 mg of potassium for 1/3 of a medium cucumber.
- National Institutes of Health Office of Dietary Supplements.“Potassium Fact Sheet For Consumers.”Explains potassium intake targets, food sources, and who may need extra care with intake.
